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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'faae4f8fa9aaccbc0b49ebb1cccf65101868914e46ac74de7fa4d99518eac6bc' 
  AND token = 'IDOGX02HEAHTVePodv/JruU80KfUevN5EjCB2VjTyqM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}